System and method for purifying and preparing high-purity vanadium pentoxide powder

Patent metadata

Field	Value
Publication number	US-10125024-B2
Application number	US-201615547068-A
Country	US
Kind code	B2
Filing date	Jan 28, 2016
Priority date	Jan 30, 2015
Publication date	Nov 13, 2018
Grant date	Nov 13, 2018

Abstract

The present invention provides a system and method for purifying and preparing vanadium pentoxide powder. Industrial grade vanadium pentoxide is converted to vanadium oxytrichloride by low temperature fluidizing chlorination, wherein chlorinating gas is preheated via heat exchange between fluidizing gas and chlorination flue gas, and an appropriate amount of air is added to enable a part of carbon powder to combust so as to achieve a balanced heat supply during the chlorination, thereby increasing the efficiency of chlorination and ensuring good selectivity in low temperature chlorination. The vanadium oxytrichloride is purified by rectification, and then subjected to fluidized gas phase ammonification, thereby obtaining ammonium metavanadate, and further obtaining a high-purity vanadium pentoxide powder product through fluidized calcination. The system and method have advantages of favorable adaptability to raw material, no discharge of contaminated wastewater, low energy consumption and chlorine consumption in production, stable product quality etc.

First claim

What is claimed is:

1. A system for purifying and preparing high-purity vanadium pentoxide powder, comprising a feeding device, a low temperature chlorination fluidized bed, a rectification and purification device, a gas phase ammonification fluidized bed, an ammonium metavanadate feeding device, a calcination fluidized bed, a tail gas washing absorber, an induced draft fan and a chimney;
wherein the feeding device comprises an industrial grade vanadium pentoxide hopper, an industrial grade vanadium pentoxide screw feeder, a carbon powder hopper and a carbon powder screw feeder;
the low temperature chlorination fluidized bed comprises a chlorination bed feeder, a chlorination fluidized bed body, a chlorination bed cyclone separator, a flue gas heat exchanger, a flue gas condenser, a chlorination bed acid-seal tank and a chlorination bed spiral slag-discharging device;
the rectification and purification device comprises a distilling still, a rectifying column, a distillate condenser, a reflux liquid collecting tank, a silicon-containing vanadium oxytrichloride storage tank, a rectification section acid-seal tank, a high-purity vanadium oxytrichloride condenser, and a high-purity vanadium oxytrichloride storage tank;
the gas phase ammonification fluidized bed comprises an ammonification bed air purifier, an ammonification bed gas heater, a vanadium oxytrichloride nozzle, a gas phase ammonification fluidized bed body, an ammonification bed cyclone separator, and an ammonification bed discharger;
the ammonium metavanadate feeding device comprises an ammonium metavanadate hopper and an ammonium metavanadate screw feeder;
the calcination fluidized bed comprises a calcination bed air purifier, a calcination bed gas heater, a calcination bed feeder, a calcination fluidized bed body, a calcination bed cyclone separator and a high-purity vanadium pentoxide hopper;
wherein a feed outlet at the bottom of the industrial grade vanadium pentoxide hopper is connected with a feed inlet of the industrial grade vanadium pentoxide screw feeder; a feed outlet at the bottom of the carbon powder hopper is connected with a feed inlet of the carbon powder screw feeder; and a feed outlet of the industrial grade vanadium pentoxide screw feeder and a feed outlet of the carbon powder screw feeder are both connected with a feed inlet of the chlorination bed feeder through a pipeline;
a feed discharge opening of the chlorination bed feeder is connected with a feed inlet at the upper part of the chlorination fluidized bed body through a pipeline; a gas inlet at the bottom of the chlorination bed feeder is connected with a nitrogen gas source main pipe through a pipeline; the chlorination bed cyclone separator is provided at the center of the top of the expansion section of the chlorination fluidized bed body; a gas outlet at the top of the chlorination bed cyclone separator is connected with a hot flue gas inlet of the flue gas heat exchanger through a pipeline; a cold flue gas outlet of the flue gas heat exchanger is connected with a gas inlet of the flue gas condenser through a pipeline; a gas outlet of the flue gas condenser is connected with a gas inlet of the chlorination bed acid-seal tank through a pipeline; a gas outlet of the chlorination bed acid-seal tank is connected with a gas inlet of the tail gas washing absorber through a pipeline; a slag-discharge opening at the lower part of the chlorination fluidized bed body is connected with a feed inlet of the chlorination bed spiral slag-discharging device through a pipeline; a gas inlet at the bottom of the chlorination fluidized bed body is connected with a hot gas outlet of the flue gas heat exchanger through a pipeline; and a cold gas inlet of the flue gas heat exchanger is connected with a chlorine gas source main pipe, the nitrogen gas source main pipe and a compressed air main pipe through pipelines, respectively;
a liquid outlet at the bottom of the flue gas condenser is connected with a feed inlet of the rectifying column through a pipeline; a steam outlet of the distilling still is connected with a steam inlet of the rectifying column through a pipeline; a backflow inlet of the distilling still is connected with a liquid reflux outlet at the bottom of the rectifying column through a pipeline; a gas outlet at the top of the rectifying column is connected with a gas inlet of the distillate condenser through a pipeline; a liquid outlet of the distillate condenser is connected with a liquid inlet of the reflux liquid collecting tank through a pipeline; a reflux liquid outlet of the reflux liquid collecting tank is connected with a reflux liquid inlet at the top of the rectifying column through a pipeline; a feed discharge opening of the reflux liquid collecting tank is connected with an inlet of the silicon-containing vanadium oxytrichloride storage tank through a pipeline; an exhaust gas outlet of the silicon-containing vanadium oxytrichloride storage tank is connected with a gas inlet of the rectification section acid-seal tank through a pipeline; a gas outlet of the rectification section acid-seal tank is connected with a gas inlet of the tail gas washing absorber through a pipeline; a rectificate outlet of the rectifying column is connected with a gas inlet of the high-purity vanadium oxytrichloride condenser through a pipeline; a liquid outlet of the high-purity vanadium oxytrichloride condenser is connected with a liquid inlet of the high-purity vanadium oxytrichloride storage tank through a pipeline; and an underflow outlet is provided at the bottom of the distilling still;
a gas inlet of the ammonification bed air purifier is connected with the compressed air main pipe through a pipeline; a gas outlet of the ammonification bed air purifier is connected with a gas inlet of the ammonification bed gas heater, a gas inlet of the vanadium oxytrichloride nozzle, and a gas inlet at the bottom of the ammonification bed discharger through pipelines, respectively; the gas inlet of the ammonification bed gas heater is connected with an ultrapure water main pipe and a purified liquid ammonia main pipe through pipelines; a combustion-supporting wind inlet and a fuel inlet of a combustion nozzle of the ammonification bed gas heater are respectively connected with the compressed air main pipe and a fuel main pipe through pipelines; a gas outlet of the ammonification bed gas heater is connected with a gas inlet at the bottom of the gas phase ammonification fluidized bed body through a pipeline; a liquid outlet of the high-purity vanadium oxytrichloride storage tank is connected with a vanadium oxytrichloride inlet of the vanadium oxytrichloride nozzle through a pipeline; the ammonification bed cyclone separator is provided at the center of the top of the expansion section of the gas phase ammonification fluidized bed body; a gas outlet at the top of the ammonification bed cyclone separator is connected with a tail gas treatment unit through a pipeline; a feed discharge opening at the upper part of the gas phase ammonification fluidized bed body is connected with a feed inlet of the ammonification bed discharger through a pipeline; and a feed discharge opening of the ammonification bed discharger is connected with a feed inlet of the ammonium metavanadate hopper through a pipeline;
a feed outlet at the bottom of the ammonium metavanadate hopper is connected with a feed inlet of the ammonium metavanadate screw feeder; and a feed discharge opening of the ammonium metavanadate screw feeder is connected with a feed inlet of the calcination bed feeder through a pipeline;
a gas inlet of the calcination bed air purifier is connected with the compressed air main pipe through a pipeline; a gas outlet of the calcination bed air purifier is connected with a gas inlet of the calcination bed gas heater and a gas inlet at the bottom of the calcination bed feeder through pipelines, respectively; a combust

Assignees

• Inst Process Eng Cas
• Beijing Zhongkaihongde Tech Co Ltd
• Inst Of Procees Engineering Chinese Academy Of Sciences
• Beijing Zhongkaihongde Tech Co Ltd

Inventors

• Zhu Qingshan
• Yang Haitao
• Fan Chuanlin
• Mu Wenheng
• Liu Jibin
• Wang Cunhu
• Ban Qixun

Classifications

• B01D3/143

  by two or more of a fractionation, separation or rectification step · CPC title

• B01L5/04

  Gas washing apparatus, e.g. by bubbling · CPC title

• C01G31/02 Primary

  Oxides · CPC title

• B01J6/004

  using hot gas streams in which the material is moved · CPC title

• B01J2208/00017

  Controlling the temperature · CPC title